code is a library, we strongly recommend using the [Guava Beta Checker] to
ensure that you do not use any `@Beta` APIs!**

[Guava Beta Checker]: https://github.com/google/guava-beta-checker

<!-- References -->

This can be very useful for setting up **resources** that you need to use for the whole app, and that are **shared** among requests, and/or that you need to **clean up** afterwards. For example, a database connection pool, or loading a shared machine learning model.

## Use Case { #use-case }

Let's start with an example **use case** and then see how to solve it with this.

This method returns a function. And that function is what will receive a request and return a response.

Here we use it to create a `GzipRequest` from the original request.

{* ../../docs_src/custom_request_and_route/tutorial001_an_py310.py hl[19:27] *}

/// note | Technical Details

A `Request` has a `request.scope` attribute, that's just a Python `dict` containing the metadata related to the request.

**FastAPI** предоставляет `starlette.staticfiles` под псевдонимом `fastapi.staticfiles`, просто для вашего удобства, как разработчика. Но на самом деле это берётся напрямую из библиотеки Starlette.

///

### Что такое "Монтирование" { #what-is-mounting }

"Монтирование" означает добавление полноценного "независимого" приложения на определённый путь, которое затем обрабатывает все подпути.

   - Include context in the summary: what changed, why, and any issue references.
   - Use `[WIP]` for in-progress PRs to avoid premature merging or choose GitHub draft PRs.

2. **Commits**:
   - Write clear messages: what changed and why (e.g., “Refactor S3 API handler to reduce latency so that requests process 20% faster”).

### JVM platform

This is a platform that builds on the core and software platforms to add support for developing software that runs on the JVM.
This includes software that is implemented using Java, Kotlin or some other JVM language.

This platform provides specific support for Java, Groovy and Scala, and includes the foojay toolchain plugin.

### Extensibility platform

  }

  /**
   * Returns the {@link Method} instance for {@link #testAddAll_unsupportedNonePresent()} so that
   * tests can suppress it with {@code FeatureSpecificTestSuiteBuilder.suppressing()} while we
   * figure out what to do with <a

          <required>true</required>
        </field>
        <field>
          <version>1.0.0</version>
          <name>description</name>
          <description>The description of what this expression references, and what it's generally used for.</description>
          <type>String</type>
          <required>true</required>
        </field>
        <field>
          <version>1.0.0</version>

**FastAPI** stellt dasselbe `starlette.staticfiles` auch via `fastapi.staticfiles` bereit, als Annehmlichkeit für Sie, den Entwickler. Es kommt aber tatsächlich direkt von Starlette.

///

### Was ist „Mounten“ { #what-is-mounting }

„Mounten“ bedeutet das Hinzufügen einer vollständigen „unabhängigen“ Anwendung an einem bestimmten Pfad, die sich dann um die Handhabung aller Unterpfade kümmert.

Let's imagine that we want to have a dependency that checks if the query parameter `q` contains some fixed content.

But we want to be able to parameterize that fixed content.

## A "callable" instance { #a-callable-instance }

In Python there's a way to make an instance of a class a "callable".

Not the class itself (which is already a callable), but an instance of that class.